High polymer anti-crack paste could reinforce local structural layer of asphalt pavement by effectively resisting the tensile stress at the crack of the layer and controlling the crack width. In this article, the influences of width, tensile rate, clamping distance and surface fabric on the tensile properties of crack paste samples were studied with electronic universal testing machine controlled by microcomputer. Results showed that the tensile strength of polymer anti-crack paste decreased and changed remarkably with the increase of width, but increased gradually with the increase of tensile rate. Clamping distance had no obvious regular effect on the tensile strength of the crack paste; while the properties of surface fabric had large impact on the tensile strength of the crack paste.